You must find the peculiarity of Chinatsu's fantasies and drawings as funny for this special to be entertaining to you. This works for me, as Chinatsu's tendencies are just part of the hilarity that are the characters of Yuru Yuri, so I find this little supplement a fine addition to the Yuru Yuri videos; for some it simply does not.

This special just essentially extends the joke about the contrast between how she draws and just about everything else about her (e.g. fantasies, outward attitude). The entertaining aspect of this special is not so much [Chinatsu's] story or [Chinatsu's] characters, but the elaboration of the joke
itself, which is just fine (Fine = 6).

Story: 6
Remember that one episode where the Amusement Club learned about Chinatsu's artistic flair through her illustrated fanfiction? Yeah. Here's the extended version. Nothing to it really, not exciting or funny (in a traditional sense). I mean, if you like Chinatsu's fantasies, then by all means.

Art:
...

Sound: 7
The voice was steady, not aggravating, and the acapella sound effects were funny. The music is the same one that seems overused in the original show. Nothing special at all.

Character: 5
I was expecting a reaction out of Retorting Dwarf- I mean, tsukkomi- I mean, Yui. Or at least, a reaction from someone. Turns
out it's literally just Chinatsu's story, uninterrupted and without commentary. Doesn't say much about characters, except it unnecessarily stresses the delusions of Chinatsu's "senpai" obsession.

Enjoyment: 4
It was.. okay.. I guess it was worth 3 minutes..

Overall: 5
With most specials, you get funny scenes or downright out-of-character characters, but this was just an unabridged version of a moment in the original episode. Just add a couple more horrific drawings and that's Yuru Yuri's special.